Rotary shaft multiposition electrical controller



March 16, 1954 T. B. JOCHEM ROTARY SHAFT MULTIPOSITION ELECTRICAL CONTROLLER Filed July 3, 1950 ll Sheets-Sheet l S 1 MOTOR LI P/P/M/IRY L CONTROL 5 March 16, 1954 T, JOCHEM 2,672,579

ROTARY SHAFT MULTIPOSITION ELECTRICAL CONTROLLER Filed July 3, 1950 ll Sheets-Sheet 2 SWITCH Qfwfi, COMMUTATION SCHEDULE I vERmER RESISTOR MAIN RESISTOR E SWITCHES SWITCHES OPEN CLOSE. oPEN CLOSE. 1 ALL. ALL. 2. E7 5s 4 49 5 as 6 2,7 39 7 58 5o 8 49 2,9 9 as I0 59 5| n 5o 12. 2.9 4| |5 40 5: l4 5| 5| I5 30 42. I6 4| n 52. 52, I8 5| 45 m 4a 54 E0 55 zl 5a 55656 53 43 44547 2,5 54 55658 2:4T0 REPEAT STEPS 4a. 2, TO a0 45 5a. 54 44 45 6 55 45 45 54 44 56 46-ro REPEAT sTEPs 64 a, T0 2.0 65 5a. 55 55657 66 45 54656 46645 67 54 454747 57659 68 TO REPEAT sTEPs a5 a T0 |9 March 16, 1954 Filed July 3, 1950 T. B. JOCHEM ROTARY SHAFT MULTIPOSITION ELECTRICAL CONTROLLER ll Sheets-Sheet 5 I SPEED REDUCTION GEARING' Bmvme MOTOR POSITIONING POSITION 5 MECHANISM LOCK lfll I [i WEE/67 60" VERNIER SWITCH DRUM DRIVE. GEARING MAW INTERLOCK 69 SWITCH SWITCH DRUM DRUM March 16, 1954 T. B. JOCHEM ROTARY SHAFT MULTIPOSITION ELECTRICAL CONTROLLER ll Sheets-Sheet 4 Filed July 5, 1950 March 16, 1954 T. B. JOCHEM ROTARY SHAFT MULTIPOSITION ELECTRICAL CONTROLLER Filed July 3, 1950 11 Shee'ts-Sheet 5 March 16, 1954 Y B, JQCHEM 2,672,579

ROTARY SHAFT MULTIPOSITION ELECTRICAL CONTROLLER Filed July 3, 1950 Y 11 Sheets-Sheet 6 89 7* 84 3 a a so 105 9 9& 95

1.25 L lzs March 16, 1954 1-. B. JOCHEM 2,672,579

. ROTARY SHAFT MULTIPOSITION ELECTRICAL CONTROLLER Filed July 3, 1950 ll Sheets-Sheet 7 March 16, 1954 JOCHEM 2,672,579

ROTARY SHAFT MULTIPOSITION ELECTRICAL CONTROLLER Filed July 3, 1950 ll Sheets-Sheet 8 March 16, 1954 T. B. JOCHEM ROTARY SHAFT MULTIPOSITION ELECTRICAL CONTROLLER Filed July 3, 1950 11 Sheets-Sheet 9 March 16, 1954 JQCHEM 2,672,579

ROTARY SHAFT MULTIPOSITION ELECTRICAL CONTROLLER Filed July 3,1950 11 Sheets-Sheet 1o March 16, 1954 JQCHEM 2,672,579

ROTARY SHAFT MULTIPOSITI ON ELECTRICAL CONTROLLER Filed July 3. 1950 ll Sheets-Sheet ll REV. FOR. L1 a0! zoo 3,

8.. a. #6! l Z100 6! Q -ezoz zclm k"515 l FORWARD a a 1 FOR. LIMIT 204 1 --o S -0. v Q

| l 5 o 0 2 00 fiOZ 5 I i 0' x c I I M w l REVERSE i=1 I 04 I O 1 E@ CR I 2oz REV. LIMIT 806 i I I O.

I I am 6 G i I zoz Q lgofi l fflx as 6 CR O O 0 j cR Patented Mar. 16, 1954 ROTARY SHAFT MULTIPOSITION ELECTRICAL CONTROLLER Theodore B. Jochcm, Wauwatosa, Wis., assignor to Cutler-Hammer, Inc., Milwaukee, Wis., a corporation of Delaware Application July 3, 1950, Serial No. 171,854

29 Claims.

This invention relates to an electrical controller of the rotary shaft, multi-position type.

While not limited thereto the present controller is particularly adapted for controlling the speed of a driving motor of a printing press and for controlling auxiliaries of such printing press.

Large printing presses are commonly afforded main driving power. by polyphase wound rotor induction motors, and it is required that such motors be afforded a great number of definite operating speeds between 25% and 100% rated speed so that a corresponding number of speeds for the printing press will be afforded. Speed control of such motors is usually obtained by providing a network .of external resistors in circuit with the motor secondary and commutating such resistors into and out of circuit in a predetermined manner. Where a great number of definite operating speed points for the motor is desired, which differ in small increments and decrements, this requires that a large number of resistors be used in the external network and the attendant circuit wiring becomes rather complex. It is a primary object of this invention to provide a controller, which in conjunction with a preferred type of network of external resistors, is adapted to effect commutation of such resistors in a multiplicity of steps, such as will afford a great number of definite operating speeds for a wound rotor induction motor driving a printing press with a substantial reduction in the number of external resistors and circuit wiring required.

Another object is to provide a controller of the aforementioned type which in addition is adapted to control the auxiliaries of a printing press.

A further object is to provide a controller of the aforementioned type which is compact and permits ready access to and replacement of its electrical switching components.

A still further object is to improve the details of construction and operation of the various component parts of a controller of the aforementioned character.

Other objects and advantages of the invention will hereinafter appear.

The accompanying drawings illustrate a preferred embodiment of the invention which will now be described, it being understood that the embodiment shown is susceptible of modification in respect of its details without departing from the scope of the appended claims.

In the drawings:

Figure 1 diagrammatically depicts a three phase wound rotor induction motor and control means for the primary and secondary thereof.

Fig. 2 is a table indicating a preferred sequence for commutating the external secondary resistance for themotor shown in Fig.- 1.

Fig. 3 shows more or less schematically a preferred motor operated controller for effecting the commutations set forth in Fig. 2.

Fig. 4 is a fragmentary view in side elevation showing the details of a positioning mechanism of the controller of Fig. 1.

Fig. 5 is a view in vertical section showing details of the position locking mechanism of the controller of Fig. 1.

Fig. 6 is a view taken along the line 66 of Fig. 4.

Fig. 7 is a view taken substantially along the line of Fig. 4.

Fig. 8 is a view taken substantially along the line 88 of Fig. 4, partially in side elevation and partially in vertical section, of certain parts of the positioning mechanism and vernier switch drum of the controller of Fig. 1.

Fig. 9 is a sectional view taken substantially along the line 99 of Fig. 8.

Fig. 10 is a fragmentary view in side elevation showing the drive mechanism between the Vernier switch drum and themain and interlock switch drums of the controller of Fig. 1.

Fig. 11 is a view taken along the line lI-ll of Fig. 10 showing a portion of the drive mechamsm.

Fig. 12 is a view taken substantially along the line l2--l2 of Fig. 10 showing another portion of the drive mechanism.

Fig. 13 is a view taken along the line l3l3 of Fig. 10 showing certain details of the main switch drum.

Fig. 14 is a view in top plan of the interlock switch drum.

Fig. 15 is a view in side elevation of the interlock switch drum.

Fig. 16 is a view taken substantially along the line lG-IB of Fig. 15.

Fig. 1'7 is an enlarged fragmentary view, similar to Fig. 16, but showing certain portions cut away and certain of the parts in a different operating relation.

Fig. 18 is similar to Fig. 17, but showing certain of the parts in a still different operating position, and

Fig. 19 diagrammatically depicts an electrical control system for the controller driving motor.

Referring to Fig. 1, it shows a three phase wound rotor induction motor 25 having a primary 25 and a secondary 25 Primary is provided with terminals T T and T which are connectable to supply lines L L and L respectively, of a three phase alternating current source through the medium of motor primary control 26 of any preferred type. The secondary 25 of motor 25 is provided with external terminals S S and S through the medium of which the speed of the motors is adapted to be controlled by connection of external resistance in varying amounts with each of the latter terminals. When a motor, like motor 215 -isiused,.for driving; a printing .press or theililce, it is-desired that iitb'eilsuitabii controlled by commutation of external resistance in each of the phases of the secondary to afford a multiplicity of speed points between 25% and 100% rated speed. A preferred networliofi secondary resistors and commutating meantitherefor which affords the motor;eightyetwotseparate speed points between 25% and ltl%irated :speed with a minimum of resistors and wiring will now be described.

Termina1 S has permanently connected thereto a series arrangement Vernier resistors al, b c (1 e and l and main resistors A, D and G. Othenmain resistors:J and M are also connectfabledn parallel "with.said"'vernier'"resistor and in"series 'iwithisaidi'main resistors; Terminal S likewise haepermanently"connected thereto in "seriesfiircuitwernier resistors a b, 0 d e *and mainresistoi's B,arid Other'main re- .sistors K, and Marc 'connectable in parallel with i "thel'asflmntioned "Vernier resistors and infseries Wltii-tliemainresistors B, "E andH." Similarly, terminal S has permanently"connectedthereto ir1"":'e1"ies arrangementwernierresistors ,'b 0 ,d e f and main resistors C, F and If Other niain 're sistoi's and O-"areconnectable in parallel with the last mentioned Vernier resistors ancliri series 1vith'mainresistors C, "Band I. i ii -The vemieeresistors a a and a have c'onnection with achother in! or-star arrangement.

ifissoeia tedwitn each of the resistors aforedescribed, except-main resistorsfl and M, K and M, i 'arid li anda' areshunting means including normally open switche's which when"closed -prdvide I i s u ti that resistor and 1 all res sistoi-s below 'it from the-hetwork'. More particularlyf vernier' resistors a b 0 d e and f .'-hav assoeiated therewitlinorinal-ly open switches 28 29?30,"34* anii' 3-2 and' main -resistors A, D ent! G have ass'ociated therewith normally open switches 33, 34 and 35. Vernier resistors 05 b We, d ie dnd fl have associated-therewith the umcmially opemswitchesllii'l, 39, 58; 4 and 43 respectively, and 'main resistors B, E and H have l aesoeiaited therewitli the nomially -open switches t me and 462 ilernier resistors a i'b '.c d e and i have associated therewitn the normally 'iziz upenfrcontactsmlyi 503 M}: 52;. 5& and 54,:1 respsc tively, and main resistors C, F an'dmhaveasso cmciatedi therewithwtheinomnallyopen switches 55,

56 and 51, respectively. :iri-Mainaresistors J61 and Mohaveassociated "therewith the normallysopen' switche' i 3fiiizandi 31 &. mWith'; switcl'r iifivclosediiand "switch 3 t open; both ofitliezmairrir'esistors'Jzand M. are placed in xparaileltiwiith thslvemierrresistors a to fl; whereas if switch 31 is closed only resistdr M issoa in- :"cludedxiiMain resistor's K and N likewise have ribrnially dpen-=' switches 'M- and 48 'which-" perform the same function in respect of vernier resistors 0. t6 f as switchsi iiii and 3'l-; Siinilarly;-=main resistors Land O have associatedtherewith the normally o'penswltches" 5B- tb 59 which perform 13* the sameiu'nctions' as switches 36 and 3T aforedescribed.

"Referring" to Fig. 2, it shows a'fschedulefor ,Tco'm'mutatmn of normally open switches 21 to 59, j lwhicli ifiallowedi'iwilliafford eightihtwof. separate opratingspeedrpoint's for motor125... ItLwi-ll be a; notedthat while eighty-two different speedpoints a. varesaflorded; .Jthat eightyvfivei steps of i switch eommutations are required. ingoing f rom a con- -'sii-iditioxi 1 edssnaximum motor z-seeondary resistance to a condition of zero external motor secondary .resistancesand vice mversa -s Jlhe ,repeated com- .mutation of nt'aforedes'cribed ver-nier resistors in going from step 2 to 20, step 24 to 42, step 46 to 64, and step 68 to 85 as indicated in Fig. 2, makes possible saving in the number of resistors, shunting switches and wiring needed. The change in -s ess, imgoing from one speed point to th next .higher or lower speed point, of course depends mhpoxiwthefivalues" of the resistors shunted in or soutof circuit. It is, of course, desirable that the resistance values of the main and Vernier re- "bistors' be sultably selected so that in efi'ecting ...change in speed of motor 25 according to the schedule of commutations of Fig. 2 the speed change will be substantially linear. Referring to Fig. 3, it'shows sfimotorf'driven controller which is"particular1y adapted""for effecting commutation of the-secondary fresisto" ance switches; shown and'des'cribed inconn'ection with'Fig. 1, inaccordancewiththec'ornmutation schedule of Fig.2,- and whicii'aflordsoth'er switch commutations that may be needed in thecontrol of a motoifi'like' the motdr' 25 and" fcreontrol of auxiliary apparatus on a printing "press or' the "likel' "'I'heschematic sncwme in" Fig. "S dep'icts the general arrangement and" eoordiriatiorr of the major components of"the' eontrellerI uch major components'c'om'prise a main suppdrting 6' member 60, anelectric dflvin'gdnotor 6i speed reduction gearing 62, a drive slia'ft-'-61Hpositioning mechanism 64, position-"lock fl, a-vernier switch drum 66; anoperatingwhaft fi'l'ior -dium 56', gear drive mechanism-68; wmam-"switcii 'd'rum 69, anbperating shaft 10 for drufii BS-Paii interlock switch drum Hyena an -ope'rtitizig sliaft 12 for'dru'm 1 I.

General arrangementoftheicontroller 'The' controller isafiordedadrive in reverse' dimtrection's by imotor 6|; which: in ionert preferred form is amsplit .fie1d,.-sing1e .phaseualternating current motors A preferreda'control;systemzzfor controlling athersenergization ofzmotor' Ni in drive of-the-controller will be heneiriafterwdescribed in 1- detail.

.Driveshaft 63 is -drivembwmotowi with! at greatly .red'uced 'speed. throughwtheiwmedium of 1 speedreduction gearingflguthe speed ofiishatt 63 preferably being in the range of B te-115:. R: BE M. JAs most any speed. reducingw geairingli affording the desired"speedrreductioni betweennmntor- GI and shaft 63 can beused; i-detailed description of i the same will not be made.

Drive of operating shaft :81: oivemieri'drum B6 fromdrive shaft 83 is threughpositioningrmechanism 64. Positioning i mechanism" 6 ljtwhich jwill -*be hereinafter described: in "detail; insures that 'following operation of .the'controllerto effect a -new operating position, operating ;shafts='-61';- 10 G0 and 12 of vernier, main andminterlockws'witch drums 66, 19 and .l'l 'respectivelypwillalways be so positioned that theswitches ofithewrespective drumswillbe either fully opened or tullyplosed. l Positioning mechanism 64- is constructed: that "it affords twenty-four definite operating.positions I 'for operating shaft 61= inone revolutioni ofethe clatter.

Position-look: 65 comprisesamelectromagnetically controlled plunger whichi' cooperateswith a certain part of positioning-.mechanism fit to lock 5 the controller in-- f definites-operaiting positions, iwhereimthe main-,-.vernier and'qrinterlockadrum rswitches are:-fully; opened ort'rullyclosed.

wvemierswitch druma 66 compnmesceighteen 7 separate selfeontainedtswitch runits-mhichsare arranged in three vertical rows disposed in an are about operating shaft 61. Each such row of switches comprises six switch units. Operating shaft 61 is provided with six switch operating cams; each such cam being operatively associated with the three switches in a common tier. The surfaces on the cams are so cut that of rotation of shaft '51 (corresponding to movement between one and another definite operating position) is required for opening or closing a switch. Further, the cam surfaces are so cut that upon rotation of shaft 61 in one direction from a given starting operatingposition to the third operating position no commutation of any of the 18 switches of drum 66 is effected; each of the switches then being in open circuit condition. Rotation of shaft 61 in said one direction from the 3rd to the 23rd operating position, corresponding to movement through 20 operating positions, will effect commutation of each of the eighteen switches in any desired sequence, such as for example, in accordance with the preferred switch commutation schedule indicated between steps 1 to 23 of Fig. 2. Rotation of drive shaft 61 in the reverse direction from said given starting operating position effects commutation of the eighteen switches in the reverse sequence.

Operating shaft 10 of main switch drum 69 is afforded drive through a rotary angle of once each revolution of operating shaft 61, through the medium of an interrupted gear tooth mechanism forming a part of gear drive mechanism 63. Rotation of shaft 10 through the angle of 45 occurs in three successive 15 steps, and, only when shaft 61 is rotating to complete the last 45 of a single revolution in said one direction thereof from its given starting operating position, or, when shaft 61 is rotated the first 45 from its given starting operating position in the opposite direction.

Main switch drum 69 is similar in construction to vernier switch drum 66, but comprises sixteen separate switch units arranged in two vertical rows. Each vertical row comprises 8 switch units. Operating shaft 10 is provided with eight switch operating cams like the cams carried on shaft 61 of vernier switch drum 66. It may be assumed that fifteen ofthe switches of drum to correspond to the fifteen switches, 33 to 31, 44 to 48, and to 59 required for commutation of main resistors A to 0 shown in Fig.1, and further, that such fifteen switches will be afforded commutation during rotation of operating shaft 1|} through 135 in accordance with steps 21 to 23, 43 to 45, and 65 to 67 of the schedule of Fig. 2. Drum 69 is provided with mechanical stops which limit the rotation of operating shaft 10 through an angle of 135 in reverse directions, thereby also limiting the rotation of operating shaft 61 of vernier switch drum 66 to 3% revolutions in reverse directions.

Operating shaft 12 of interlock switch drum 1| derives its drive from shaft 61 of vernier switch drum '66 through a gear reduction drive, forming a part of drive gearing 68. Shaft 12 is afforded drive at one-quarter the angular velocity of shaft 61 and rotates whenever the latter is rotating. Thus for every 15 of rotation of shaft 61, shaft 12 rotates correspondingly through an angle of 3%9.

Interlock switch drum 1|, which is essentially different in arrangement and construction from drums 6t and 69, is provided with aplurality of self-contained switches. Operation of the sw besp rum e f c by o ation o shaft 12. As will be later more fully described, each of the switches of drum 1| has actuating means individual thereto and said means are adjustable so that commutation of a switch may be set as desired at any one of ninety-four different operating positions of shaft 12 which are spaced at a rotary angle of 3%. With respect to the control system of Fig. 1, it may be assumed that the switches of drum 1| serve no direct purpose. Two of the switches of drum 1|, as will be hereinafter explained, are preferably utilized as limit switches in the preferred control system for controlling the energization of driving motor 6| of the controller. Other of the switches of drum 1| may be used for effecting commutations of auxiliary control circuits for a machine which may be driven by the motor 25 of Fig. 1, such as a printing press or the like.

In order to provide a more complete understanding of the controller, the structural details of positioning mechanism 64, position lock 65, vernier switch drum 66, main switch drum 69, drive gearing 68, interlock switch drum 1B, and the aforementioned control system for controlling the operation of. driving motor 6| will now be described. hereinafter under appropriate head ings.

lfositiom'ng mechanism and position lock and which is rigidly secured to brackets 14 and 15 adjacent the outer ends of the latter brackets.

Speed reducing gearing 62, is provided with a housing 11 having a flange 11 seating against and rigidly secured to the upper surface of bracket 14. Drive shaft 63 extends through a suitable clearance opening formed in bracket 14 and adjacent its lower end has a coupling member 18 nonrotatably secured thereto. Coupling 18 is preferably square in horizontal cross section as shown in Fig. 6, and is provided with a circular opening extending therethrough within which shaft 63 extends. Coupling 18 is non-rotatably secured to shaft 63 by a key 19 fitting in alined keyways in shaft'63 and coupling18, and by a set screw taking into a threaded opening f ormed in coupling 18 and bearing against one side of key 19. Another set screw M is preferably used in conjunction with coupling 18 and shaft 53 to insure good non-rotatable securement to each other. As best shown in Figs. 6 and 8, coupling 18 projects through a central clearance opening 82 formed in an annular clutch disc 82 and adjacent its lower end tightly engages a circular disc 83 within a complementally formed square opening in the latter. Disc 83 is formed of a friction material, like that used for brake linings and clutch facings, and on its lower face engages with the upper surface of a position indexing wheel 84.

Indexing wheel 84 is provided with 24 slots 84 and. a corresponding number of complementally formed teeth 84. The slots 84 are spaced at equal radial angles of 5 about the periphery of wheel 84 and are substantially rectangular in form. will be hereinaf er more fully explained,

lvided withsix ieircuilar npeninssris aoe wat 2?!!31' :radiazlwangles of 60? and lymg adieoentrtheinner .endsof the slots Met. -.-Ea ih ofatheiatter [openin accommodates reduced: portionsmf cylind-ricel pins 86 which are. :riveted over va einst manne surface of wheel. i814 'iandiwhieh DIOJ' est: unwaizdl'y at a right angle from :the la-tter andthrotl hzclearr .ance, .iopeninss: formed-min aqlutchwidific 1 .2; Th shanks .of pinsnafi extend a substantial distance beyond the surfac'e-mf .;dis,c 8,2 wand are threaded.z-adjaoent rztheirnum er zendsi; Compression springs; 8.1 ware positionedabout Leach-inf the shanks. of: pinsr-86 and eseatzzat: their lower ends against the upperzzsurface :of ediSC x82 :1 '.At th upper ends,springs43;! seat:againstammlanwaahers :and arerconstrained in martial-1y wmpnessed condition by pairs JOfxIliltS takinsonto the tlnzeadedrend portions ;of pinsfifi; :a

vAs ZbCStxShOWIl in :Fig; "8, {indexing awheel dijis provided with ,aa centralcoil:(w.1a;1':- opening 1-849 -'to accommodate "in :tightlyifittine iengagement- :the upper cylindrical end portion of a flanged, cylindrical hub member 83. The flan eof member 88 seats and is welded to the lower surface of wheel 84. Memberf88 i$pr0videdwith an openingiwexv tending qtherethrougnzzvwhich his substantially square in horizontal cross section. The uppenend portion-15'! of operating'ishaft r87 cerrespending square formcini'horizontalcross section, and

the member flaunts about said pontionnfxsaid shaft andais LthEIGbYIIOCkBd againsturelatiize rotation withfrespeotthereto; The assembly comprising wheel 5 and :member 188: is secured age-inst movement axially of ;-shaft :BJ-vby a bolt 89 which takes intoza threadedrecess:formeduinfithe upper ratchet-wheel '92 within-a circular opening-formed therein. Hub portion'fiz is provided withmndm wardly extending flange overlyingtheupper end of said opening and bearing ;9 I I is adaptedrto seat thereagainst. .An annular ring is -seov.ired=tor--the lower surface of hubfportion 92 to retainl' bearing fll 'inseatingi zelation within said hubgportion;

The:asse1nbly comprising ratchet-wheelzflfi and "bail bearing-" :91 is constrained:' against downward movement on =hub1B8wby; an annular-spacingpnllar '93: positioned about 'zthe cylindrical l portion figl act operatingwshaft 61; Collar '93at;its lower and seat against; thexinner: racei'of a ball hearing which is press-fitted-zom the cylindrical portionzfir'l of operating shaft'ltfil. "Thesouterrace of bearing 94?- is press-fittedeto? bracket 1715,:3Wii5h'l11chfli1611131 opening formed therein; and to theinnensurtace of an: annular ring '9fi which is welded" to the-low er surface of-"bracltet l l ism-afford added-bearing surface; Bearing M iseonstrained against movement eupwardly of braeket -IS a-andrring n9 5 RWQI periphery of' ratchet wheel '92.-

Mate. seemed-do the; noses autism-wt zbmelretcli, which slate :1. i and-w cn-cr rl es mtemaoer ,n .A qizmed-ionishafitifi at the of im reemof ro t ons fifi with is cy indricak iqn Miwnonstmins ebealzme 1 zesein tid miwers m vement axial y sha t i61 A ih st Ease-i1 1'1 and-8* 8.2318 n 1 iticaldzimens omthensth zhub 2% subsist tieilyievi-shwed his donned ts :mrinth renal-ed e. sfrhew eethrilitze ere i hty; spaced rmreach \otherat ienu lradialism lesiof 1159-: "T e-sa te? nortionsrhetween teeter-Q2? comprise commemtally;dormed-nctchesmqe' Anieion et dmmenins -92"?- is *iormed iniipontiomiw! a vwheelxfinand 350 rl-entered; z ilihtgli pectz 17130 1211133 vloneitud nel dimension ithatiit extendsseqin-dist nt eni maisite tsides 10f :la wadialf :line drummin wthrqueh; $1 center of onmof :the teeth .1329. =3: 1 v

A lcyl-lndricalwpin $6.; ipreiereibly rhalvinzv a idli- 'ameter equalito onemalfithe-longitud-inm dimenv 51011 ..of opening 1 82 an. iWhQfil' 182; :18 zrig idly eecured to the wheel v ,riandiextends; downwavdlw a right: angleitrom the, lower surface onf athe latter through; the opening .82.! iwheelrfl sPinfsiinnd opening. 192 zitafiord I a 310st iimotion son)- nection-hetweenindexingiwheemll and ifl'tclmt wheel .8 2 :5

As best shown in Figs-:4 fa lever M215 pivo tallyisupported 'ediacentmne'endithereof on a tbolt sga'lWhiCh')t kS' -intO 1a threadedwreoeas formed a cylindrioahpost 99;;71 Th1e zpost-fiaawis rigidly secured to zzther-upperi suriiace ,of i a; rectan gularibracket emflgand said ibraeket is acljustably :mountedon the iuppertsurfacei-of:bracket r 15 by means of bolts which penetrate relongated openfines-donned inlibracket. l' flu 'sadjacent -the-=ends thereof, andwhich take into ithreaded openings in' bracketflfit' A member-1w! geis rigidly-secured to lever JIiadjacent: :the iother end :of the latter and i projects-outwardly the'rebeyond. Member in His provideck witha threadedopeningextending transversely therethlough adjacent- :its *free end and a threaded actuating member 02 1s adjustably aceommedatemwithin said opening. Member 102 is -provided-with ia hemispherically shaped =head Nil and is retained in ade'usted position with: respect to iniember ml by -a nut taking upagainst the latter; -Substantialiy mid waymetween the endgofilevert-l, aroller I08 is secured thereto by-means *of a =pin rlM- nonrotatably fixed to leverflland- ;lia;viri an enlargedhead overlying the 'upper surface-enroll I03; R-Rolle'r lfll is'free to turn -on pin *lM and is adapted-to engage'ratchet-wheel 9 2 gen theteeth fl a-ndwithin the notches- M 'the'reotj; A tension spring I05, secured at one-endto leverfl and at its "other end etc a pin I" lifi riy i dly secured to-and protecting upwardly at a r-ight angl e from bracket 15 5 constantly biases lever "QT-toward the Consequently; rolle'r039is caused-to alternately ridein the notchejsviw and on the teeth -MFas-ratchet wheel 92 is rotated; thereby-musing "levera96 to oscillate "aboutits "pivot;

As best shown in Figs. 4 and 7, a relay CRrof thetypeyshownand described in the' Kuhnet -;al. Patent No. 23843621;- issued-dune 1942, his mounted on support 60" so :that onelimb ct its armature m -is the vpatkr of the hea'd- 1&0! of MI. head a N) 9 upon oscillation of lever 91, is adapted to engage and move armature CR of relay CR into the position it normally assumes by virtue of energization of its operating winding CR Relay CR carries a set of normally open contacts CR a set of normally closed contacts CR and a bridging contactor CR which is common to both sets of stationary contacts and movable therebetween by the armature CR As will be later more fully explained, contacts CR and CR of relay CR are connected in circuit in the control system of the controller driving motors 6I and their commutation is effected by electromagnetic operation of armature CR afforded by energization of winding CR and by mechanical operation, afiorded by member I02.

Position lock 65 comprises the aforementioned plunger 85 having a roller 85, a molded insulating supporting block I01, a magnet frame I08, a movable armature I09, a molded insulating block I I0, movable by armature I09 and carrying a bridging contactor III, a pair of molded insulating blocks H2, each of which is secured to magnet frame I08 on opposite sides of block IIO, a pair of stationary contacts II3, each of which is secured to the end of a block H2 and adapted to be bridged by contactor III, and an electromagnetic operating winding II4. Supporting block I01 has portions I01 and NF, extending through a rectangular clearance opening 16* formed in bracket 16 and merging with a portion I01 which overlies and seats against the outer surface of bracket 16. Block I01 is rigidly secured to bracket 16, and in turn has rigidly secured thereto magnet frame I08. Magnet frame I08 has secured thereto, at its end adjacent block I01, channel-shaped guide members II5 which extend partially across the length of the magnet frame I08. Operating winding H4 is positioned about the guide II5, centrally between the opposite ends of magnet frame I08. Armature I09, which is adapted to reciprocably move in the guides H5, is a built up structure comprising legs I09 and N9 spaced apart by a section of laminations of magnetic material I 09, and bushings I09 secured to the inner surfaces of legs I09 and I09 adjacent corresponding ends thereof. The legs I09 and I09b and bushings I09 of armature I09 have alined openings formed therein to accommodate a shaft H6, which extends through said armature. Rollers II1 are positioned on shaft I I 6 adjacent each end thereof, above and below the legs I09 and I09 of armature I09, and said rollers roll in guideways formed interiorly in the portions I01 and I01 of block I01.

Plunger85 is provided with a molded insulating member 85 of forked form which comprises a reduced portion 85. The portion 85 is provided with an opening to accommodate the shaft I I6 which extends therethrough. Member 85 is provided with portions 85 and 85 integrally connected with the portion 85. Portions 85 and 05 have alined openings extending therethrough to accommodate a shaft I I8. The roller 85 is positioned with a free fit on the shaft I I8, and roller 85 is'adapted to'freely rotate on shaft I I8 within a notch between the portions 85 and 85 Shaft I I8, like shaft II6, is fitted with rollers I I9 which are adapted to roll in the aforementioned guideways in portions I01 and I01 of block I01. The legs I09 and I09 of armature I09 extend aconsiderable distance beyond the section I09, straddle a portion IIII! of magnet frame I08, and

10 said legs are rigidly attached to block IIO immediately adjacent their ends.

The bridging contactor III is resiliently supported on block I I0 and the contactor is adapted to bridge stationary contacts II3 when armature I09 is moved a predetermined distance towards the right, as viewed in Figs. 5 and 6. A pair of compression springs I20 positioned about guide pin I2 I, carried on end brackets of magnet frame I88, are adapted to bias the assembly comprising contactor III, block H0 and armature I09 for movement towards the left, as viewed in Figs. 5 and 6.

When operating winding H4 is energized, armature I09 is caused to move towards the right, as viewed in Figs. 5 and 6, until the end of its section I09 engages and seals against the portion I03 of magnet frame I09. When armature I09 has reached this sealed position, the roller has been fully withdrawn from engagement with indexing wheel 84 and the contactor III is in engagement with the stationary contacts II3. When roller 85 is free of wheel 84, the latter is free to rotate under the drive of motor BI through the aforementioned slip-clutch driving connection. Upon deenergization of operating winding II4, armature I09 tends to move towards the left under the bias of springs I 20. As will be hereinafter more fully explained in connection with the control system for motor 6I, winding H4 is always deenergized at such time, upon initiation of stopping action, that roller 85* of plunger 85 always drops on the end of tooth 84 of wheel 84 and rides into an immediately adjacent slot 84 thereby locking wheel 84 against further rotation. The contacts II3 are connected in circuit in the control system for motor GI and the purpose and effect of their commutation will be hereinafter explained.

Vernier switch drum A preferred form for Vernier switch drum 66 is shown in Figs. 4, 8 and 9.

Switch drum 68 comprises eighteen plunger operated electric switch units I 25 which are adapted to be operated by cams I26 carried on operating shaft 61. Switch units I25 are carried and supported in pairs in blocks I21 formed of molded electrical insulating material. Three switch blocks I21, carrying a total of six of the switch units I25, are arranged'in a vertical row, and three such vertical rows of switch blocks I26, designated I, II and III are spaced at rotary angles of about operating shaft 61.

Operating shaft 81 is provided with a portion I51 which is square in horizontal cross section as shown in Fig. 9. The portion 81 of shaft 61 extends beyond the upper and lower limits of the vertical rows of switch blocks I, II and III. As best shown in Fig. 8, shaft 61 extends through and below an L-shaped bracket I28 which is rigidly secured to support 60 and which extends in parallel relation to brackets 14 and 15. A ball bearing I29 has its inner race press-fitted to the portion 61 of shaft 61 and its outer race is pressfltted to bracket I28, within an opening formed in the latter, and to the inner surface of a ring which is welded to the upper surface of bracket I28 to afford additional bearing surface. Shaft 61 and ball bearing I29 are constrained against downward movement with respect to bracket I28 by a plate I30 secured to the bottom surface of bracket I20 and having a clearance opening therein-for shaft 61. i j

The switch carrying blocks I21 are formed in ll one-piece and on their outer faces are provided with upper and lower; front opening recesses I21 and I21 alike in form, and another. front opening recess I21 lying between the recesses I21 and I21. The recess I21 is separated from recesses I21 and I21 by horizontal barrier portions I21 and I21. Recess I21 is closed at its upper side by an extension of the top end portion I21 of block I21 and recess I21 is closed at its bottom side by an extension of the bottom end portion I21 of said block. The blocks I 21 are supported in thevertical rows on pairs of supporting shafts I3I, which are rigidly secured at their upper and lower ends to brackets I5 and I28, by screws which penetrate screw receiving openings, communicating with recess I21, and take intothreaded openings in said shafts; the inner faces of the blocks being suitably formed so that they overlie and clamp against the shafts I3I.

As best shown in Figs. 8 and 9, the blocks I21 are provided with a portion I21 which extends beyond the shafts I3I toward operating shaft 61. The portion I21 is provided with a pair of openings I21 extending t herethrough and communicating with the recesses I21 and I21 respectively. A one-piece, molded insulating plunger I32 is positioned within each of the openings I21 and extends within the recesses I21 and I21". Plungers I32 are each providedwith a rectangular shoulder I32 which is adapted to engage with a ledge portion of the bottom wall of the recesses I 21 and I 21 overhanging the openings I21 and limit the movement of the plungers in one direction. Adjacent one end, the plungers I32 are provided with cylindrical portions I32 on which are adapted to loosely fit bridging contactors I33; the latter being'provided with central clearance opening extending through a flanged portion I33s. Contactors I33 are provided with lugs I33 depending on opposite sides thereof, which are accommodated within guideways formed in the portions I21, I21", I21 andI21 as the case may be, thereby being constrained against endwise movement within the recesses I21 and I21 The bridging contactors I33 are: adapted to engage with pairs of stationary contacts I 34 mounted on opposite sides of each of the openings I21 and seating against the bottom walls of the recesses I21 and I21. Each of the contacts I34 is secured to block I21 together with a terminalmember I33. Asbest shown in. Fig. 9, certain of the terminal members I35 are bent at a right angle so as to insure against interference with the terminal members carried on blocks in the adjacent vertical rows.

Compression springs I 36 are associated with each of the contactors I33 and at one end abut against the latter about the flanges I33. At their other ends the springs I36 abut against lugs I21 which are integrally formedwith end portions I21 and I21 and barriers Iii and I21 of block I21,and which extend partially over thefront ends: of recesses I21 and I21 Theends of? the lugs I2! are of hook form and overlie the endmostcoils of springs I 38 to constrainthem against lateral displacement. Asbest shown in Fig. 8, plungers I32 at their other ends are of forked form and the end portions I32 and I 32 thereof are provided with alined openings extending'therethrough toaccommodateshafts I'flrwitha-free fit. Shafts I31, which extend above andbelowrportions I32 and I32, respectively, have loosely fitted, there- 'on, adjacent :each. of their .ends,erollers.3I33. Rollers I38 are. adapted: to roll in guideways formed in the blocks I21, andruare adapted. to afford movement of. the...plungers I32 within blocks I21. with a. minimum of frictional resistance.

A roller. follower. I39 is: loosely. fitted to the shafts I33 within: the. notch between portions I32 and I32 of plunger I32 and is adapted to engage. with the cam surface of a cam I25 carried on operating shaft 61.

There are six of the cams I26 non-rotatably secured toytheportion 51. of .shaft 61 and are so spaced: thereon that-the cam. surface of each cam engages; with the roller followers I33 of three switch units I25,.lying1n a. common tier aboutthe shaft 31.. Asbest shown in Fig. 9,..each of: the cams I26 isbuilt up of complementally half sections I25 and I26 bolted together on the portion til of shaft 61. A continuous cam surface comprising-.zhigh and low portions I26 and I2.6,-.respectively, are provided on the sections; I2G'*'and I26 on which the roller followers I33 ofthe switchunits I25 ride. When thesshaft 61 is rotated; andjany of the roller followers I39 ride up on thehigh portions I26, the plungers I32 and bridging contactors I33 are moved against the bias ofthesprings I36 to eifect disengagement of contactors. I33-from their associated pairs of stationary-contacts I34. .The springs I361normally bias plungers: I32. and contactors I33formovementin a direction effecting engagement of. the latter "with their associated stationary contacts whenever. its associated roller follower I39 rides on: the low portion I26 of a camI26..

It is a feature-of the construction of switch units I25xand their supporting blocks; I21, that the contactors I 33 I and. stationary contacts I 34 may be readily removed. and replaced without need for removal of theswitch blocks fromthe supporting. shafts.- 30. Access is had through the front. ends of recesses I21 and: I21 to compression springs I36 (seeFigs. 4 and 9) and the latter may bereadilyremoved by compressing them-clear-ofengagementtwith the lugs I21. and withdrawingthe. same. sideways of the latter. Contactor- I33 may thenbe slipped off the portion I32. of plunger- [32,. tipped on its side so that its lugs I32 aredisengaged from their guideways in..blocks I21. and then withdrawn. With contactors I33.removed, it willbe apparent thatstationary contacts I34 and terminal members. I35 can bereadily removed and replaced.

In order to disassemble a plunger I32 from a switch block I21, it is required that the latter be. removedfromv thesupporting. shafts I30. Then, assuming that the spring-I36 and contactor I33 associated therewith has first been removed, a plunger I32 can be withdrawn. by slightly. tipping it to one side of the opening I2! so that its shoulder I32 clears the ledge overhangingsaid opmingandpulling it clear of the block.

. .Main'switch'drumike the twitchurified",arecarrled and g which are rigidly secured at their upper and lower ends to L-shaped brackets I46 and I41. Brackets I46 and I41 are rigidly secured to support 60 and extend in parallel relation to brackets 14, and I28.

Operating shaft 10 is provided with a portion 10 of square horizontal cross section, which extends beyond the upper and lower limits of the vertical rows of switch blocks IV and V. Eight of the cams I26 are mounted on the portion 10 of shaft 10 and are spaced therein so each such cam is engaged on its cam surface with the roller followers I39 of two switch units I forming a common horizontal tier of switch units.

Operating shaft 10 is afforded rotational bearing support in brackets I46 and I41 by ball bearings I and I49, respectively, which are press-fitted to cylindrical portions of shaft 10 and to said brackets; the manner of the mounting being substantially the same as hereinbefore described in connection with operating shaft 61 of vernier switch drum 66.

As best shown in Figs. 10 and 13, upstanding posts I50 and I5I are rigidly secured to the upper surface of bracket I41. Posts I50 and I5I are provided with threaded openings extending therethrough adjacent their upper ends and bolts I52 threadedly engage with the posts therewithin. Bolts I52 are locked in adjusted position in said posts by nuts taking up against lock washers bearing against the posts. A pin I53, rigidly secured to the portion 10* of operating shaft 10 and projecting at a right angle therefrom in a line with the heads of the bolts I52, is adapted to engage with the heads of either of bolts I52 when shaft 10 is rotated to limit the angular rotation of the latter to a part of a single revolution. In the preferred embodiment of the controller, the posts are so placed and the bolts I52 so adjusted that the angular rotation of shaft 10 is limited to 135.

Interlock switch drum A preferred form for interlock switch drum H is shown in Figs. 10, 14, 15, 16, 17 and 18.

Interlock switch drum II is afforded support on the brackets I46 and I41 of main switch drum 60. As best shown in Fig. 10, angle brackets I55 and I56 are welded to the upper and lower surfaces of brackets I46 and I41, respectively, and brackets I55 and I56 have rigidly secured thereto L-shaped brackets I51 and I58, respectively.

Operating shaft 12 is supported in brackets I51 and I58 on ball bearings (not shown) in a manner similar to that hereinbefore described in connection with operating shaft 61 of vernier switch drum 66. Annular rings I59 are welded to the lower and upper surfaces of brackets I41 and I48, respectively, to afford added bearing surface for the last mentioned ball bearings. Shaft 12 and these ball bearings are constrained against movement upwardly or downwardly relative to brackets I51 and I58 by plates I66 secured to the upper and lower surfaces of brackets I51 and I58, respectively.

Drum 1I comprises a plurality of plunger operated switch units I6I, similar in construe tion and arrangement to those disclosed in teeth I61 Patent No. 2,521,519 granted September 5, 1950,.

to Richard B. Hunter and Harold L. Mekelburg. Switch units I6I are enclosed and supported in vertically alined groups of three in pairs of interfitting, molded insulating blocks I62 and I63 which are similar in general arrangement and construction to corresponding switch supporting blocks shown in the aforementioned Hunter et al. patent. Each of the switch units Jill is biased to circuit-closed position and ,has a plunger actuator I6I with a roller follower I6I attached to the end thereof. A plurality of the interfitting switch blocks I62 and I63 are supported in a vertical row on a pair of supportingshafts I64 which are rigidly secured at their top and bottom ends to brackets I61 and I58, respectively.

Each of the roller followers IIiI of the switch units I6I has associated therewith an operating cam I65. ,The cams I65 are carried on a shaft I66 which is non-rotatably secured to the brackets I51 and I58. Each of the cams I65 is secured, as by welding, to a hub portion I61 of a gear I61 which extends through a clearance opening in the cam. The assembly comprising a cam I65 and a gear I61 is rotatably mounted on a flanged bushing I68 which in turn is rotatably mounted on shaft I66. The upper ends of each of the bushings I68 seats against the lower surface of a gear I61 and serve to space adjacent cam and gear assemblies from each other on shaft I66. Spacing collars and shims are positioned on shaft I66 above the uppermost bushing I66 and the lowermost gear I61 to space the plurality of cam, gear and bushing assemblies properly between the brackets I51 and I56.

The gears I61 are a special form of twelve tooth gear having four teeth I61 extending across the full width of the gear and spaced at rotary angles of about the periphery of the gear, and have eight teeth I61 extending from one face of the gear only part way across the width thereof. A pair of the teeth I61 are interposed between any two of the full-length The teeth I61 and I61 have the same profile and are equally spaced about the periphery of gear I66. Four arcuate concaved depressions I61 are formed in the hub portion I61 adjacent the ends of the pairs of teeth I61 An assembly comprising a laminated twotoothed gear sector I69 and a notched circular disc I10 cooperate to afford intermittent drive and locking of each of the gears I61. Gear sector I69 comprises teeth I66 and H56 which are integrally formed with a bracket portion I66. Sector I69 is rigidly secured to the disc I10 so that the notch between the teeth. of the former alines with a correspondingly formed notch I10 in the latter. The pitch radius of the combination of sector I69 and disc I10 is preferably in a ratio of 4:1 with respect to that of gear I61. Disc I10 is provided with a central. clearance opening I10 for shaft 12 and is also provided with an elongated arcuate opening W6 Opening I169 is preferably formed in respect of its arcuate longitudinal dimension so that radial. lines intersecting the ends of said openings are spaced at an angle of 30. Disc I16 is adjustably, non-rotatably secured to a disc I1I by means of a bolt 112 penetrating opening I16 and taking into one of twelve threaded openings I1I formed in disc I1I. Disc I1! is preferably smaller in outer diameter than disc I16 and isprovided with asquare central'opening to receive the corresponding square portion 12* of operating a esasfzo shatt I2, :thembwinsuning:nonerotatablaasecurement oflclsaid discrz .:onishafti 12.. The openings I 'I rI :i'am:preferably spacedtatequal'. radial angles the upper: surface." of. bracket I58 and adj acent.

itstupper' end." is provided with: a: portion (not shownlwhich is squareinh'orizontal cross secnon. A gearc I18 having: ar hubportion. I18;

with; a-icorrespondingly' square opening formed. therein to: accommodate. the last; mentionedwportionzoflshaft'IZ; islsecuredtoshaitfli by. means of a bolt I19 taking into. athreaded recess formed in theupper end of the shaft. .2 Acircular indicia plate I60 isriveted to the upper surface of gear 118' and" is provided with. ninety-six equally spaced" marks Everyfifthuma'rk is preferably numerically indicated starting from zero (0). A stationary position. indicator IBI, having a point'ed end overlying theedge of plate 486, is rigidly secured to bracket I 51.

The cam surfaces of the cams I are provided with a high portion I 65 extending peripherally for-168 and with a low portion I651) extending 'peripherally'forthe same number of degrees: The transition from the"high to the low portionso'f the cams isprovided by portions I85 which extend peripherally for 12 therebetween.

Referring to Fig. 16;, it depicts the operating condition" of the" interlock drumjust prior to commencement of drive of. one of the cams I65 for effectingcommutation of its associated switch unitv I6I. Let it'. be" assumed that shaft 12 is being'driven in. the clockwise direction. Tooth I69 of gearsector I69 has'just engagedwith a tooth ofgearv I61 andup'on continued rotation of shaft I 2'; gear I6! and cam I 657' will be driven anticlockwise a total rotary angle of 90, during which time the roller follower I6Ib of an? associated plunger IIiI. will rideiup. from the. lower portion I65 ?,.on portion I65", onto the high. portion I65 of the cam surface; thereby effecting opening of. the contacts in a switch unit I61. .Fig. 17. depicts an intermediate point in the rotation'ofl cam' I65 where the roller follower I'6I has just ridden up onto the portion I65 of cam I65; cam' I65 havingheen. driven a rotary angle. of frornthe position dpictedinFig. 16. Cam

I will" then. continue. to rotate. another. 30 be.

otzrdisd I'IIL protecting .within; ardenression. I61! It-wilL be. apparentrthat upon rotation. oishait.

12; in. the, anticlockwise direction, the. starting conditionofuriveotcam. l65in the clockwise direction will berdepicted-byFig. 18, anintermediate condition jnst. prior. to operation. of. switch.

unit I6;I. to effeotclosure of its contacts will: be. depictedby Fig. 157, andv the condition. atthe completion of rotation ofcam I65, whereinit is:

againiocked will be depicted by Fig. 16. The arrangement permitsoperation of eachof the switch units I6I once in each revolution ofshaft "I2; either in the 'clockwise oranticlockwisadirection- Operationof: the switchunits I6I by a-=cam I65 may be adjusted tO-LOCCUI" betweencany two: of ninety-four positionsin.the rotation of shaitfii, as indicatedupon indicia: plate I80. For.:ex-- ample, suppose is: desired that closure-oi the switch unit shownimFig. 16. be eiiectedbetweenpositionsfQlff. and 90" when shaft. 12 is driven anticlockwise. shaft" 152 is'first i rotated untilv the mank*91:on indiciaz plate I alines with: the. end of indicators I61; Then bolt. I12 is loosened and-withdrawn from disc I1"I I,. through opening I10 indisc I10; and the assembly comprising disc-I 10am gear sector I69 iszshifted relative-to disc I 'I I so-that the intermediate operating condition depicted in Fig. 17-- is effected. Bolt" I1 2" is thenreinserted through opening Ill] and taken down into an opening Ill in disc I1I' which alines with opening I10; Thereafter operation of the switch unitirom open towlosedcondition of its contacts will be afiordedwhenever shaft 12 in rotatingantic1ockwise-moves from position "91" toposition- 90, and conversely the contacts of the switch' unit will be op-- erated from closed to open condition whenever shaft '12 rotating clockwise moves from position to position 91.

It will be appreciate'dthat anyone of the" switch units I 6| may be adjusted with respect to its point of operation in" the rotation of shaft I2 by following the" procedure outlined above.

The'switch units. I6I' can'only' be adjusted" for operation between anytwo' of ninetyrfour positions in the rotation ofshaft: I2 due to. the fact other of said switch units be adjusted for opening its contacts when shaft 12 rotates anticlockwise from position 1 to 0. These latter switches are-connected in circuit with the control system for driving motor" 61' and function as limit switches, as will be hereinafter described.

. Drive gearing Apreferredformior thedrive, gearing 66 for operating shafts 10. and. I2. ofmain switch drum 69 and interlockswitch drumII, respectively, is shown in. Figs. 8,10,.11, 12 and 15.

Operating shaft 61-. of. .vernier switch drum 66 hasla portion 61 101 square. horizontal cross sections extending; a; substantial distancerbelowi the loweasurfacm oi hraeketjl ifl'... ;An assembly comprising a notched circular disc I85, a twotooth gear sector I86'non-rotatably secured to disc I85, and a gear I81 are carried on the portion 61 of shaft 81 and are constrained against downward movement with respect thereto by a bolt I88 which takes into a threaded recess in the lower end of said shaft.

Gear I 81 affords drive of gear I18 on shaft 12 of interlock switch drum H in the same direction through an idler gear I89. Idler gear I89 is freely rotatable and supported on a stub shaft I90 which is non-rotatably secured to bracket I28. Shaft I90 is drilled transversely adjacent its free end to accommodate a cotter key which together With a washer serves to hold gear I89 on said shaft in meshing engagement with gears I11 and I81. Preferably, the ratio of the pitch radii of gears I81, I89 and I11 is 1:224, thereby affording drive of shaft 12 at one-quarter the angular velocity of shaft 81 of Vernier switch drum 66.

A special form of gear member I9I is freely rotatable on a shaft I92 which extends through and between brackets I28 and I46. Brackets I28 and I 46 are provided with alined clearance openings to freely accommodate shaft I92 and have annular bushings secured to their lower and upper surfaces, respect vely, to afford additional bearing surface for shaft I92 and constrain gear member I 9| against any substantial movement axially of shaft I92. Shaft I92 is secured a ainst movement relative to brackets I28 and I48 by cotter keys carried in transverse openings adjacent the upper and lower ends of the shaft.

Adjacent its upper end, gear member I 9! is provided with an eight tooth gear I93 having four teeth I93 extending the full width of the gear, and four teeth I93 extending part way across the width of the gear from the lower face thereof. The teeth I93 and I93 have the same profile and are equally spaced about the periphery of gear I93 in alternate arrangement. The assembly comprising disc I85 and gear sector I86 is adapted to effect intermittent drive and locking of gear I93; the type of drive being substantially the same as that aforedescribed in connection with the gears I81, gear sector I69, and the notched disc I ofinterlock switch drum II. In the present instance the ratio of pitch radii between the assembly comprising disc I85 and gear sector I86, and, gear I93 is.2:1. Thus ear sector I 86 and disc I85, once in each revolution of shaft 61, afford drive of gear I93 through a total rotary angle of 90 and between times affords locking of this gear against rotation.

Adjacent its lower end gear member I 9| is provided with an idler gear I94 meshing with a gear I 95 carried on shaft 18 of main switch drum 69. The gears I93 and I94 of member I9I are integrally connected by a cylindrical hub portion .I96 and a central clearance opening for shaft I92 extends through gears I93 and I94 and portion I98. The ratio of the pitch radii of idler gear I94 and gear I95 is 1:2. Gear I95 is nonrotatably secured to shaft '10 and is constrained against movement axially thereof by a bolt I91 taking into a threaded recess formed in the end of shaft 10.

It will be apparent that gear member I9I will be driven a total rotary angle of 90 each revolution of shaft 81, in the reverse direction, and

that shaft 10 is thus driven a total rotary angle of 45, in the same direction as shaft 61 once ;.d 1,r ng ach evo utioniof the latter. As aforeindicated, shaft 10 is limited to 135 of rotary movement. When the pin I53 on shaft 18 engages either of the heads of bolts I52 carried in the posts I58 and I 5| in main switch drum 89, further rotation of shaft 10 is prevented. Shaft 61 of vernier switch drum 66, however, is free to rotate another 315 before the gear sector I86 and disc I again come into position to drive gear I93. As shaft 18 cannot rotate, gear memher I 9| is consequently locked against further rotation, and further rotation of shaft 61 is accordingly prevented. As shaft 12 of interlock switch drum 1| derives its drive from shaft 81, it is likewise incapable of further rotation.

Control system for the controller driving motor A preferred control system for driving motor 8| is diagrammatically depicted in Fig. 19.

As aforeindicated, driving motor 6I in a preferred form is a split field, single phase alternating current motor. Asshown in Fig. 19, the fields of motor 6| are designated IiI and El Motor BI is connected at one side to supply line L of a single phase alternating current supply source and its field 8| is connectable to line L of said source by closure of normally open contacts 200 of an electromagnetic contactor 208, which has an operating winding 200 and two other pairs of normally open contacts 288 and 280 Field winding 6| is connectable to line L by closure of normally open contacts 20I of an electromagnetic contactor 20I which has an operating winding 20I and two other pairs of normally open contacts 20I and 20F.

An electromagnetic relay 282 has an operating winding 282 which is in circuit across lines L and L in series with the normally open contacts of a momentary type of push-button switch 203, the normally closed contacts 204 of an electromagnetic relay 204 and a limit switch 285; limit switch 285 being that one of the switch units I 6| of interlock switch drum 1I set for opening of its contacts when shaft 12 reaches the limit of its rotation in the clockwise direction as viewed in Fig. 16. Relay 202 is provided with normally open contacts 202 and 202 and with normally closed contacts 202 and 282. Relay 204 is provided with an operating winding 284', an additional pair of normally closed contacts 284 and normally open contacts 204 and 204.

Winding 200 of contactor 200 is connectable to supply line L through contacts 202 of relay 202, and also through contacts N3 of position lock 65 and contacts 200 of contactor 288. Winding 200 is connectable to line L through contacts 204 of relay 204 and limit switch 285.

Operatin winding 204 of relay 284 is connectable across lines L and L in series with the normally open contacts of a push-button switch 206 (like switch 209), contacts 202 of relay 202 and a limit switch 201; limit switch 281 being that one of the switch units I6I of interlock switch drum 1| set for opening of its contacts when shaft 12 reaches the limit of its rotation in the anticlockwise direction as viewed in Fig. 16. Operating winding 20I of contactor 20I is connectable to line L through contacts 208 of relay 284, and also through contacts II3 of position lock 05 and contacts 2! of contactor 2!". Operating winding 20I is 'connectable to line L through contacts 202 of relay 282 and limit switch 201.

Operatin winding I I4 of position lock 85.is connectable to line L either through contacts 202 of relay 202, through contacts 284. of relay 

